package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private WorkspaceService workspaceService;


    /**
     * 统计营业额
     * @param begin
     * @param end
     * @return
     */
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {

        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while(!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }


        List<Double> turnoverList = new ArrayList<>();
        //select sum(amount) from orders where status = 5 and order_time > beginTime and order_time < endTime
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap<>();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            if(turnover == null){
                //当天没订单查询数据库返回null
                //需要将null转成0
                turnover = Double.valueOf(0);
            }
            turnoverList.add(turnover);
        }

        return TurnoverReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();
    }


    /**
     * 统计用户
     * @param begin
     * @param end
     * @return
     */
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while(!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        List<Integer> newUserList = new ArrayList<>();
        List<Integer> totalUserList = new ArrayList<>();

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap<>();
            map.put("end", endTime);
            Integer totalUser = userMapper.countByMap(map);
            totalUserList.add(totalUser);

            map.put("begin", beginTime);
            Integer newUser = userMapper.countByMap(map);
            newUserList.add(newUser);

        }

        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .build();
    }


    /**
     * 订单统计
     * @param begin
     * @param end
     * @return
     */
    @Override
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while(!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        List<Integer> orderCountList = new ArrayList<>();
        List<Integer> validOrderCountList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Integer orderCount = getOrderCount(beginTime, endTime, null);
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);
            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }

        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();

        Double orderCompletionRate = 0.0;
        if(totalOrderCount != 0){
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }


        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }


    /**
     * 统计订单数量
     * @param begin
     * @param end
     * @param status
     * @return
     */
    private Integer getOrderCount(LocalDateTime begin, LocalDateTime end, Integer status){
        Map map = new HashMap<>();
        map.put("begin", begin);
        map.put("end", end);
        map.put("status", status);
        return orderMapper.countByMap(map);
    }


    /**
     * 统计销售排名前十的商品
     * @param begin
     * @param end
     * @return
     */
    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        List<GoodsSalesDTO> salesList = orderMapper.getSalesTop10(beginTime, endTime);

        List<String> names = salesList.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");

        List<Integer> numbers = salesList.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers, ",");


        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }


    /**
     * 导出运营数据报表
     * @param httpServletResponse
     */
    @Override
    public void exportBusinessData(HttpServletResponse httpServletResponse) {
        //1.查询mysql数据库获取营业数据-查询近30天
        //LocalDate dateBegin = LocalDate.now().minusDays(30);
        // LocalDate dateEnd = LocalDate.now().minusDays(1);
        LocalDate dateBegin = LocalDate.now().minusDays(29);
        LocalDate dateEnd = LocalDate.now();

        LocalDateTime beginTime = LocalDateTime.of(dateBegin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(dateEnd, LocalTime.MAX);

        //1.1 查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(beginTime, endTime);


        //2.通过POI将营业数据写入excel文件
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
        try {
            XSSFWorkbook excel = new XSSFWorkbook(in);
            XSSFSheet sheet1 = excel.getSheet("sheet1");

            //填充数据--时间区间
            sheet1.getRow(1).getCell(1).setCellValue("时间：" + dateBegin + "至" + dateEnd);

            XSSFRow row4 = sheet1.getRow(3);

            //填充数据--营业额
            row4.getCell(2).setCellValue(businessDataVO.getTurnover());
            //填充数据--订单完成率
            row4.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            //填充数据--新增用户数
            row4.getCell(6).setCellValue(businessDataVO.getNewUsers());

            XSSFRow row5 = sheet1.getRow(4);
            //填充数据--有效订单
            row5.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            //填充数据--平均客单价
            row5.getCell(4).setCellValue(businessDataVO.getUnitPrice());

            //填充数据--近30天的数据
            for (int i = 0; i < 30; i++){
                LocalDate date = dateBegin.plusDays(i);
                //某一天的数据
                BusinessDataVO businessData = workspaceService.getBusinessData(
                        LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

                XSSFRow row = sheet1.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }


            //3.通过输出流将excel文件下载到浏览器
            ServletOutputStream out = httpServletResponse.getOutputStream();
            excel.write(out);

            //4.关闭资源
            in.close();
            out.close();
            excel.close();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

    }
}
